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Deleting a single message
1. On the All messages screen, tap a contact (or phone number) to
display the exchange of messages with that contact.
2. Tap the message that you want to delete.
3. If the message is locked, tap Unlock message on the options menu,
and then tap the message to display the options menu again.
4. Tap Delete message, and then tap OK.
Deleting several messages within a conversation
1. On the All messages screen, tap a contact (or phone number) to
display the exchange of messages with that contact.
2. Tap   > Delete messages.
3. Tap Delete by selection or Delete by phone number (if the contact
used multiple phone numbers throughout the conversation).
In the Messages settings, tap General > Delete old messages to
auto delete old messages per conversation.
Deleting a conversation
1. On the All messages screen, press and hold a contact (or phone
number) whose messages you want to delete, and then tap Delete.
2. Tap OK to delete the entire thread. 
Messages
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